Question

A body of mass 300 gm is at rest. What force in newton will you have to apply to move it through 200 cm in 10 s?

• A. zero
• B. 12 newton
• C. 0.12 newton
• D. 0.012 newton

Answer 1

Answer: (D)

0.012 newton

Here displacement is $s=200cm=2m$ in time $t=10sec$.

As body is inititally at rest, so $u=0$.

As $s=ut+a{t}^2/2$

So, $2=0+a(10{)}^2/2\Rightarrow a=2/50=0.04m{s}^{-2}$

Mass is $m=300gm=0.3kg$

So force is $m\times a=0.3\times 0.04=0.012newton$